<p>With the acceleration of industrialization, heavy industries such as coking and steel production have been generating increasing amounts of waste gas. Emissions of industrial waste gas have a serious environmental impact, leading to the widespread use of multidimensional evaluation approaches. In this study, typical industrial waste gas treatment technologies, namely those for coke oven gas and sintering flue gas, are comprehensively reviewed, with particular focus on three dimensions: environmental impact assessment, carbon footprint analysis, and economic evaluation. The environmental burden of the coke-oven-gas-to-hydrogen (COGTH) process is lower, and the carbon footprint of semi-dry flue gas desulfurization + bag filter + selective catalytic reduction denitrification (SBS) is relatively low. Based on economic evaluation, wet flue gas desulfurization + wet electrostatic precipitator + selective catalytic reduction denitrification technology often shows lower economic efficiency. By considering the abovementioned aspects, this review synthesizes existing knowledge and proposes a structured framework integrating “2E + C” dimensions for a more systematic comparison of different waste gas treatment processes. This framework highlights the importance of jointly considering the three dimensions. A comprehensive comparison of the two industrial waste gas treatment processes indicates that COGTH and SBS exhibit better ecological and economic benefits. Overall, this research aims to address pollution due to industrial waste gas and provide guidance for selecting appropriate waste gas treatment technologies.</p>